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Java example source code file (SwingTest.java)

This example Java source code file (SwingTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, gui, height, illegalaccessexception, illegalargumentexception, instantiationexception, invocationtargetexception, iterator, method, reflection, runnable, securityexception, set, suntoolkit, swing, swingtest, throwable, util, width

The SwingTest.java Java example source code

/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import sun.awt.SunToolkit;
import java.awt.Toolkit;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
 * SwingTest is a utility class for writing regression tests
 * that require interacting with the UI.
 * It uses reflection to invoke all public methods without parameters.
 * All static methods are starting on the current thread.
 * Other methods including constructor are starting on the EDT.
 * Between each method invocation all pending events are processed.
 * The methods are sorted by name and invoked in that order.
 * Failure of the test is signaled by any method throwing an exception.
 * If no methods throw an exception the test is assumed to have passed.
 *
 * @author Sergey A. Malenkov
 */
final class SwingTest implements Runnable {

    private static final int WIDTH = 640;
    private static final int HEIGHT = 480;

    public static void start(Class<?> type) throws Throwable {
        new SwingTest(type).start();
    }

    private final Class<?> type;
    private final Iterator<Method> methods;

    private JFrame frame;
    private Object object;
    private Method method;
    private Throwable error;

    private SwingTest(Class<?> type) {
        Set<Method> methods = new TreeSet(new Comparator() {
            public int compare(Method first, Method second) {
                return first.getName().compareTo(second.getName());
            }
        });
        for (Method method : type.getMethods()) {
            if (method.getDeclaringClass().equals(type)) {
                if (method.getReturnType().equals(void.class)) {
                    if (0 == method.getParameterTypes().length) {
                        methods.add(method);
                    }
                }
            }
        }
        this.type = type;
        this.methods = methods.iterator();
    }

    public void run() {
        try {
            if (this.object == null) {
                System.out.println(this.type);
                this.frame = new JFrame(this.type.getSimpleName());
                this.frame.setSize(WIDTH, HEIGHT);
                this.frame.setLocationRelativeTo(null);
                this.object = this.type.getConstructor(this.frame.getClass()).newInstance(this.frame);
                this.frame.setVisible(true);
            }
            else if (this.method != null) {
                System.out.println(this.method);
                this.method.invoke(this.object);
            }
            else {
                System.out.println((this.error == null) ? "PASSED" : "FAILED"); // NON-NLS: debug
                this.frame.dispose();
                this.frame = null;
            }
        }
        catch (NoSuchMethodException exception) {
            this.error = exception;
        }
        catch (SecurityException exception) {
            this.error = exception;
        }
        catch (IllegalAccessException exception) {
            this.error = exception;
        }
        catch (IllegalArgumentException exception) {
            this.error = exception;
        }
        catch (InstantiationException exception) {
            this.error = exception;
        }
        catch (InvocationTargetException exception) {
            this.error = exception.getTargetException();
        }
        System.out.flush();
        this.method = this.methods.hasNext() && (this.error == null)
                ? this.methods.next()
                : null;
    }

    private void start() throws Throwable {
        do {
            if ((this.method != null) && Modifier.isStatic(this.method.getModifiers())) {
                run(); // invoke static method on the current thread
            }
            else {
                SwingUtilities.invokeLater(this); // invoke on the event dispatch thread
            }
            Toolkit tk = Toolkit.getDefaultToolkit();
            if (tk instanceof SunToolkit) {
                SunToolkit stk = (SunToolkit) tk;
                stk.realSync(); // wait until done
            }
        }
        while (this.frame != null);
        if (this.error != null) {
            throw this.error;
        }
    }
}

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